This is the video that shows you how to upload pdfs then link to them in any of your website’s pages or products.
Go to your website in admin mode
Navigate to settings / files
Upload the file and copy the link
Edit your page or product or collection
Highlight the text you want to link from
Click on the little link button in the menu bar
Paste in the link you’ve copied, making sure it starts with http:// (not just www)
Test it in your website.
You may be seeing a blank order printer screen when you go in to the app. The good news is that it isn't broken, your browser just needs more permissions.